diff --git a/css/skeleton-auto.css b/css/skeleton-auto.css
index 6d9d188e..108f5ad6 100644
--- a/css/skeleton-auto.css
+++ b/css/skeleton-auto.css
@@ -196,6 +196,7 @@ hr {
 }
 /* Radius values:
 
+0%: Square
 10%-40%: Squircles
 50% (default): True circle
 */
diff --git a/css/skeleton-dark.css b/css/skeleton-dark.css
index fe9a7ae1..6bc15d6d 100644
--- a/css/skeleton-dark.css
+++ b/css/skeleton-dark.css
@@ -196,6 +196,7 @@ hr {
 }
 /* Radius values:
 
+0%: Square
 10%-40%: Squircles
 50% (default): True circle
 */
diff --git a/css/skeleton-light.css b/css/skeleton-light.css
index de3fd8e4..270ca627 100644
--- a/css/skeleton-light.css
+++ b/css/skeleton-light.css
@@ -196,6 +196,7 @@ hr {
 }
 /* Radius values:
 
+0%: Square
 10%-40%: Squircles
 50% (default): True circle
 */